Warp stop-motion for looms.



m. 67!,540. Patented Apr. 9, IBM. w. F. DBAPEB.

WARP STOP MOTIONFOR LOUIS.

- I (Application filed mejm, 1900.1 (No Model.) I 4 UNITED STATES PATENT OFFICE.

WILLIAM F. DRAPER, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER COMPANY, OF SAME PLACE, AND PORTLAND, MAINE.

WARP STOP-MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 671,540, dated April 9, 1901.

Application filed December 21, 1900. berial No. 0,685. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM F. DRAPER, a citizen of the United States, residing at Hopedale, county of Worcester, State of Massachusetts, have invented an Improvementin Warp Stop-Motions for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

My invention relates to mechanism for antomatically stopping a loom npon'breakage or failure of a warp-thread; and it applies more particularly to that type of apparatus wherein the stopping means is controlled as to the time of its operation by the movement into abnormal position of one or more of a series of detectors normally maintained inoperative by the warp-threads.

One of the objects of my invention is to provide a cheap and readily constructed detector which can be easily applied to the warp-thread and which is reinforced at the portion which cooperates with the feeler when a thread breaks.

Figure 1 is a cross-sectional view of a sufficient portion of a loom to be understood, with my invention illustrated in connection therewith. Fig. 2 is a detail in rear elevation of a portion of the feeler, the stop, and some of the detectors. Fig. 3 is an enlarged side view of one of the detectors made in accordance with my invention; and Fig. 4 is a like View of a detector, showing another Way of forming the integral reinforce.

Referring to Fig. l, the loom-frame A, harnesses H, and lease-rods L L may be and are of any usual or well-known construction in looms, and I have herein shown the detectors of the warp-stop-motion mechanism as located between the lease-rods and the whiproll W. Upon the loom sides I have erected upright stands A to which are secured substantially l-shaped brackets A to the depending ends of which are secured two warprests, (shown as bars a,) which extend across the loom from side to side. A pair of plates 19 are arranged in parallelism and slightly separated between the brackets a, the ends of the bars being shown as outturned, as at 72, (see Fig. 2,) and bolted to the brackets, the upper edges of each of these plates being notched (see Fig. 2) to form a series of teeth 3, one face of each tooth being substantially vertical. Between the plates, which form stops, is mounted a longitudinally-movable feeler f, shown as a flat plate set on edge and extended through a slot, as 5, Fig. 2, in each of the brackets A the upper edge of the feeler being provided with a series of teeth f, having each a substantially vertical face; but. the straight faces of the feeler-teeth are opposed to the straight faces of the teeth of the stops b, as clearly shown in Fig. 2. The feeler is connected at one of its projecting ends with a bell-crank lever f (see Fig. 2, fulcrumed atf in an ear a on one of the brackets, and the bell-crank lever is rocked by means of a link f to normally reciprocate the feeler in the direction of its length.

I have not shown herein any means for rocking the bell-crank lever, as any suitable mechanism may be employed.

A series of stop-motion-controlling detectors are arranged to cooperate with the warpthreads and be held thereby normally in inoperative position, and I have herein shown the detectors as formed of wire and generally loop-like in character.

Referring to Fig. 3, the detector D is shown as made of a single piece of wire bent to form substantially parallel elongated sides 61 and having a rentrant V-shaped shorter portion b at its lower end, one of the sides at being bent upon. itself at its extremity, as at Li and then bent over, as at d substantially at right angles to the side d and secured to the extremity of the other side at 10, as by soldering, brazing, or in any other suitable manner. The upper end or head of the detector thus presents an integral reinforced portion of increased strength, for a purpose to be described, the detector as a whole being substantially W-shaped, with the outer limbs extended and secured together at their upper ends, forming a closed elongated loop d The reinforce of the detector may be made in various ways, and in Fig. 4 I have shown the ertremities of the straight sides (1 as oppositely bent substantially at right angles, as

at d (1 and overlapped and secured together held in the position shown in Fig. 1 by int-act warp-threads, with their reinforced heads elevated above the feeler and cooperating stops, so that no obstacle is presented to the reciprocation of the feeler. Upon breakage of a warp-thread, however, its detector will drop and its head will drop bet-ween two of the teeth of the tooth-plates b, so that on the movement of the feeler in the direction of the arrow 30, Fig. 2, the upright face of one of its teeth will engage one side of the head of the dropped detector, while the other side thereof will be held stationary by the oppositely-located upright faces of the stops and continued movement of the feeler in the direction of the arrow 30 will be stopped. Through suitable intervening connections, such as shown in the patent referred to, the shipper-handle S, Fig. 1, is

released from its usual holding-notch in the breast-beam B and the loom stopped in usual manner.

It will be obvious that the detectors made in accordance with my invention can be readily and cheaply made. They are light, and yet, by virtue of the reinforced portion, are sufficiently strong to resist and stop the movement of the feeler when the head of a drop-detector is engaged, as has been described, simultaneously by a tooth of the feeler and the toothed portion of the stopplates.

When a broken warp-thread has been pieced up, it is only necessary for the attendant to lift the detector, so that it can straddle the repaired warp-thread, threading of the thread through an eye in the detector being avoided by my invention. e

The warp-rests a support the warp-threads in front of and at the back of the detectors and also serve to prevent swaying of the lower ends of the detectors.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. As an article of manufacture, awire detector having straight sides and a reontrant portion between them at one end, the opposite ends of the sides being bent and overlapped aud secured together to form a reinforce.

2. As an article of manufacture, a wire detector one end of which is substantially W- shaped, the outer limbs being extended in substantial parallelism and bent at their opposite extremities and overlapped to form an integral reinforced head.

3. In a warp stop-motion forlooms, the combination with a plurality of parallel Warprests, of a series of loop-like wiredetectors located therebetween, each detector having an integral reinforced head and a rentrant lower end to straddle a warp-thread, a feeler extended through the detectors in position to cooperate with the reinforced head of a dropped detector, means to normally reciprocate the feeler, and stopping means controlled by thefeeler.

4. In a-warp stop-motion for looms, the combination with a series of loop-like wire detectors, each having a W-shaped lower end to straddle a warp-thread and an integral reinforced head at the upper end of anotched stop and an adjacent reciprooable notched feeler, extended through the detectors and adapted to cooperate with the head of areleased detector, means to normally reciprocate the feeler, and stopping means controlled by the feeler.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM F. DRAPER.

Witnesses:

GEORGE OTIS DRAPER, ERNEST W. Wool). 

